Spore-Coated Actuator (video) Wyss Institute for Biologically Inspired Engineering at Harvard Share Print E-Mail Loading video... Caption Alternating the humidity between that of a humid, misty day and that of a dry, sunny one causes a spore-covered sheet of latex rubber to bend and straighten. A flexible, spore-covered material could be used as a humidity-driven actuator. Credit Xi Chen/Columbia University Usage Restrictions Credit: Xi Chen/Columbia University Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.